Big Cars:
At the main menu, press and hold L2+R2, then press Up, Up, Up, Square, Square, Square. 

Car Showroom:
At the Title Screen, press and hold L2 + R1, then press TRIANGLE, TRIANGLE, UP, UP,
LEFT, RIGHT, DOWN, DOWN, X, X. After you enter the code correctly, the screen will go
black and you'll be able to select any car or boss vehicle to view. Not that helpful, but, if you really
want to get an upclose view of the Tank O' Death, you can do so with this cheat. 

Extra Cash Bonus:
During the race position your vehicle on a power-up icon that always reappears as cash. The icon
will keep reappearing and you will keep picking it up. Just be sure to finish the lap before time runs
out or you will lose all the cash that you picked up. This also works with icons that always
reappear as nitros. 

Infinite Cash:
At the main menu (the one that lets you choose your car, your character, equipment, etc) press
and hold L2+R2, then press Left, Left, Right, Right, Square, Square, Circle, Circle. You should
hear a sound if you did the code correctly. 
Note: Your money won't visibly increase, but it won't decrease when you buy cars, equipment,
etc. 

Invincibility:
At the main menu hold R2+R1 and press Up, Left, Right, Down, Triangle, Circle, X. 

Small Cars:
At the main menu, press and hold L1+R1, then press Down, Down, Down, Circle, Circle. 

Total Chaos:
At the Title Screen, press and hold L2 + R2, then press DOWN, FORWARD, DOWN,
FORWARD, CIRCLE, CIRCLE, CIRCLE. If you enter the code correctly, you will be taken to
the Total Coas screen and you'll be able to make selections from playing the game from the new
screen.
NOTE: You can ONLY turn the Total Choas mode off by resetting your system 

Voodoo Car:
At the main menu, press and hold L2 then press Left, Right, Down, Up, Square, Circle, X,
Triangle.

                             Game Shark Codes

     Joker Command -D0098DFA ???? 
     Master Code - D0058CEC 3D30 
     65 Million Dollars [Note] - 
          D0098DFA 0100 
          80099954 FFFF 
               Infinite Nitro - 
                    800845B8 0000 
                    800845BA 0000 
               Infinite Armor - 
                    80065B30 0000 
                    80065B32 0000 
               Infinite Offensive Weapon Energy - 8005981A 6464 
          Note: At the main menu, press Select. You will then have 65 Million dollars. Use this
          code alone, without any other codes including the master code.